Southworth Products
DDL Dock Lift Manual
20
PROBLEM
POSSIBLE CAUSE
CHECK
Lift will not raise
Suction filter is clogged
Clean suction filter.
Vacuum leak in the suction
line
Check all fittings and hoses for damage or loose
connections.
Down valve may be energized Check wiring to down valve and solenoid valve.
Missing coupling between
motor and pump (if
applicable).
Check to make sure the coupling between the
pump and motor has been installed.
(Machines
manufactured before September 2012).
Pressure relief valve is
activated.
If there is a loud squealing noise the pressure
relief valve may be activated. – Contact
Customer Service for assistance.
External Hydraulic leak
Inspect all hoses, connections, and cylinders for
leaks.
Lift fails to hold
(Drifts down)
Down valve may be leaking
internally.
Remove the down valve and inspect for debris
which may be preventing it from closing.
C
ontact Customer Service for procedure.
Down valve may be energized Check the solenoid with a volt meter.
Cylinder may be leaking
Check for fluid leaks.
Lift will not lower
Down valve may not be
energized
Check for power to the solenoid valve with a volt
meter while pressing the down button.
Down Flow control may need
to be adjusted
Adjust down flow control as needed.
Lift raises too
slowly
Voltage may be low
Check voltage at motor. Supply voltage must
be ± 10% of the rated voltage at the motor
terminals.
Suction filter, breather cap, or
pressure line may be clogged
Remove necessary components and clean.
Pump may be overheating
due to insufficient oil
Check fluid level and viscosity.
Lift lowers too
slowly
Down valve may not be fully
opening or may be partially
blocked or stuck closed.
Remove the down valve and clean. -
Contact
Customer Service for procedure.
Flow control may need to be
adjusted
Adjust the flow control as necessary.
Pressure relief valve is
activated.
If there is a loud squealing noise the pressure
relief valve may be activated. – Contact the
manufacturer for assistance.
